Heat-insulating plaster board



March l i 1924.,

T. B. MUNROE AHEAT INSULATING PLASTER BOARD lilla Filed ADIil 2l 1925 ich' T. B. MUNROE March l1 i924.,

HEAT INSULATING PLASTER BOARD Filed April 2l', 1925 2 Sheets-Sheet 2 l te 7 showing the @card supported by a wooden Patented Mar. F11', 1924.

STATES Ltttt TREADWAY B. MUNROE, QF FOREST. GLEN, MRYLAN D. I

. maa'r-Ilarsunn'rnre rnesfrm nonni).

Application med april 21, 192s.. serial no. 533,764.

1tv stucco and like materials, and has. for its 'object to improve the somewhat similar boards heretofore proposed.

- With-these and other objects in view, the

invention consists in the novel details of construction andcombinations of parts morefully hereinafter disclosed and particularly pointed out in the claims. Referring to the accompanyin drawin forming a part of'this speci cation, in

which like'numeral's designate like parts in all the views:A

' Figure 1V isaI he'at insulating stucco or plaster board made in accordance with this inventiogpn; V

Fi re 2 is a view similar toi Figure l,

base; "n Figure 3 is an 'enlarged Y detail' sectional i view iIluStrat'ngthe-bOnding of the stucco.

auf. like material to the asphalt base; l Figure 4 is an enlarged sectional view of a somewhat modified form of vboard having the asphalt material applied to both sides thereof .w Figure 5isa diagrammatic sectionaliview showing how the board-shown in. Figure t Vmay serve-as a heat insulator in walls ci `plastic material; a. Figura@ 's a view similar to Figure 5 the application. of the form. ci board s `own in Figure l'to the'v outside, of plastic walls, pillars, etc.; anda Figure 7 1s a view similar to Figure 6, showing vthe applicationA of the form -of 5% board shown in Figure 4 to the insideif This invention relates to heat insulating W- plaster boards especially adapted for holding vof aspha In order that the precise invention may be clearly` understood, it is said: There is at present on the market a'wall covering known .as Celotex, which has a very h1 h heat insulating capacity, and which is ma e from partially cooked thread like bagasse fibers interlaced with each other into a coherent sheet like mass'having great'tensile strength.y

Its specific gravity is less than 0.6, and its heat insulating capacity is substantially equal to that of cork. In preparngthese partially cooked bagasse fibers, the cooking is stopped at such apoint as will prevent the cellular structure from breaking down, and therefore the full, strength of the original raw bers is retained. In these respects these said bers di-e'r radically from thoseadapted for use in making paper. In fact,

fore the finished board li ewi'se differs both chemically and physically from a board, gs made'of paper. Plaster adheresvto the fibrous surface of this sheet material, but cement f7@ .these fibers di'er both chemically and phys- 'ically vfrom paper makin bers, and therestuccos and concrete donot adhere thereto 1 as wellv as could be desired. On' the other hand, asphalt 1 andpitch likesubstances adhere to this elotex material exceptionallyi well. Concretein addition t9 not bonding satisfactorily witlr, Celctofi'n is alkaline in characteryf-a-ndi's"found to destroy in time th''s'trength of the fibers when applied directly thereto. But cemenand cement stucco will bond satisfactorilyl to asphalt provided the surface of the asphalt is free from dust. Therefore, in carrying out this invention, I coat the ibrous surface; 1 Aott the heat insulating Celotex f material 2 with a layer, 9o

rock capable of passing a sieve of ysay one sand. Instead of embeddin these materials after the coating operat1on, may mix them the mixture to the fibrous Celotex matel rial, The surface 5 of the asphalt 3 is next ffreed from dust and the cement stuccor is or like material 3. I then embed' in said asphalt small pieces le ofcrushed `With the asphalt l1ke material 3,' and, applyAAA v applied directly to the saidasphalt surface, i houses made of cement', the outside of wallsf when it is found that a` :irm bond is had bel and the asphalt material and that the cement material 6 adheres strongly to the surfaces 7 of the rock material 4. It will be seen that by providing the asphalt layer on the surface of the fibrous Celotex I am enabled to obtain a strong bond between the Celotex and the asphalt, and a strongerbond between the cement of the stucco and l the asphalt. Also, by providing the rock material 4 in the asphalt I increase the bonding surface of the cement and likewise obtain a strong bond between the latter and said rock material. The result is a heat insulating stucco board 8 which may be secured directly to the studding 9,

or it may,r be Secured to the sheathing 1 0 or to any other suitable support. l In the somewhat modified form of the invention shown in Figure 4, the construction of the heat insulating board is the same as,

in the preceding figures, except the asphalt and rock material layers 3 and 4 are applied to both sides of the Celotex material 2, linstead of to one-'side only. This con# struction of board having a layer 12 on each side thereof of asphalt and rock material has a number of advantages, as will be clear from the following: In Figure 5 the' Celotex material 2 with its two coats 12 of asphalt and finely divided rock material is placed inside the form 13, and concrete, cement, or other plastic material 14 is poured in on opposite sides of said Celotex 2, whereupon the cement bonds firmly to said coats or layers 12 with the result that the finished board 15 after the form is removed serves to heat insulate the wall, or

groof, or other structure formed by the cement 14. In Figure 6, the finished board 40 16 ismade in accordance with Figure 1, and

provided with only one layer 12 of asphalt and rock material., Said board is so placed as to constitute one side of the form 18 With said layer 12 on the inside thereof, where-V upon cement 14 or other plastic is poured into said form and becomes firmly bonded to saidlayer 12. The other sideof Said board 16 becomes the outside surface of thewall or other structure 14, .and may be ornamented or plastered on as indicated by the layer 19.

,In this case,'the cement 14 may well be the wall of a house, when the Celotex would 'not only serve as a heat insulating lining on the inside of said wall, but could be plastered on, painted -or otherwise o'rnamented. In

Figure 7, the construction is substantially the same as 1n Figure 6, except the Celotex is coated on both sidesto form a board 15,

as in Figures 4 and 5, andthis said board is placed on the outside v'surface of the wal1'14, which may be the wall of a house. In this case, the outer layer 12 of asphalt and stone v material may be given a layer of stucco 2O or other cementitiousmaterial, whereupon the house would be heat insulated as before with astucco outer covering.

In addition to this., the majority of stucco boards now on the market have the disadvantage of expanding and contracting to such an extent under changes of temperature', as to crack the stucco. In this board, on the other hand, the fibrous bagasse board is so orous that it expands and contracts so very little that it does not crack the stucco under the Widest temperature changes. Further, it is so compressibleor yielding that it actually gives under' the strains set up during the setting of the stucco and the hardening of the asphalt, and no cracking of the stucco follows. Another advantage flows from the compressible nature of the fibrous bagasse base in the fact that-it yields sufiiciently when the building settles slightly to prevent cracking of the stucco.

.'What I claim is:

1. A heat insulating Wall board composed of a heat insulating fibrous bagasse supporting member adapted` to bond with v asphalt and pitch like materials, but not adapted to satisfactorily bond with cement and concrete like substances, and a layer of asphalt material mixed with finely divided rock material bonded to said bagasse member.

2. In a heat insulating Wall board, the combination of a sheet of insulating fibrous -bagasse materialadapted to bond ,with asand pitch like materials, but not adapt` ed to satisfactorily bond with cement and concrete like substances, and a layer of asphalt material mixed with finely divided rock material bonded to said bagasse member on each side thereof. p

4. In a heat insulating wall board, the combination of a sheet of insulating fibrous bagasse material adapted to bond with as- .phalt and pitch like materials, but not adapted to satisfactorily bond with cement and concrete like substances and a layer consisting ofcruslied rock and asphalt, lcovering both surfaces of-and bonded to said sheet.

5. A wall composed of cement material; a

hea-t insulating bagasse materialadapted to bond with asphalt and pitchlike materials, but not adapted to satisfactorily bond with -cement and concretellike substances; asso.- elated with sald ,walk/and a layer of asphalt in which is'eliibeddd finely divided rock material bonded to said cement and eiated with said wall; and a layer of asphalt bagasse materials. in which is imbedded finely divided rock 6. A wall composed of cement material; a material on each side ot said heat insulating l0 heat. insulating bagasse material adapted to material and bonded to said cement and 5 `loond with asphalt and pitch like materials, bagasse materials.

but not adapted to satisfactorily bond with lin testimony whereof I affix mysignature; cement and concrete like substances asso- TREADWAY B. MUNROE. 

